The closer you get to Christmas the more requests are out there for tutorials on how to create snow with Flash. I guess there are zillions of possibilities, but let me mention just a few. If you know of more, feel free to add them in the comments.

I'm a little late to the party here, but you can find another snow fall FLA on my site http://gskinner.com/ . Not as fancy as R.Penners, but it looks pretty good (I'm from Edmonton,Canada, so I'm something of an expert), and it's fairly configurable.